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target/arm/arm-semi: Implement SH_EXT_EXIT_EXTENDED extension 

SH_EXT_EXIT_EXTENDED is a v2.0 semihosting extension: it
indicates that the implementation supports the SYS_EXIT_EXTENDED
function. This function allows both A64 and A32/T32 guests to
exit with a specified exit status, unlike the older SYS_EXIT
function which only allowed this for A64 guests. Implement
this extension.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20190916141544.17540-15-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2019-09-16 15:15:43 +01:00
parent c46a653c3a
commit 22a43bb9ab
1 changed files with 14 additions and 5 deletions
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19
target/arm/arm-semi.c
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@ -59,6 +59,7 @@
#define TARGET_SYS_HEAPINFO 0x16
#define TARGET_SYS_EXIT 0x18
#define TARGET_SYS_SYNCCACHE 0x19
#define TARGET_SYS_EXIT_EXTENDED 0x20
/* ADP_Stopped_ApplicationExit is used for exit(0),
* anything else is implemented as exit(1) */
@ -513,12 +514,15 @@ static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf)
#define SHFB_MAGIC_2 0x46
#define SHFB_MAGIC_3 0x42
/* Feature bits reportable in feature byte 0 */
#define SH_EXT_EXIT_EXTENDED (1 << 0)
static const uint8_t featurefile_data[] = {
SHFB_MAGIC_0,
SHFB_MAGIC_1,
SHFB_MAGIC_2,
SHFB_MAGIC_3,
0, /* Feature byte 0 */
SH_EXT_EXIT_EXTENDED, /* Feature byte 0 */
};
static void init_featurefile_guestfd(int guestfd)
@ -1042,11 +1046,14 @@ target_ulong do_arm_semihosting(CPUARMState *env)
return 0;
}
case TARGET_SYS_EXIT:
if (is_a64(env)) {
case TARGET_SYS_EXIT_EXTENDED:
if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) {
/*
* The A64 version of this call takes a parameter block,
* The A64 version of SYS_EXIT takes a parameter block,
* so the application-exit type can return a subcode which
* is the exit status code from the application.
* SYS_EXIT_EXTENDED is an a new-in-v2.0 optional function
* which allows A32/T32 guests to also provide a status code.
*/
GET_ARG(0);
GET_ARG(1);
@ -1058,8 +1065,10 @@ target_ulong do_arm_semihosting(CPUARMState *env)
}
} else {
/*
* ARM specifies only Stopped_ApplicationExit as normal
* exit, everything else is considered an error
* The A32/T32 version of SYS_EXIT specifies only
* Stopped_ApplicationExit as normal exit, but does not
* allow the guest to specify the exit status code.
* Everything else is considered an error.
*/
ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
}